The erotic movie – filmed concurrently with predecessor Fifty Shades Darker – sees Dornan and Johnson playing Christian Grey and Ana Steele for the final time.
The film fared well at the box office, helping push the overall trilogy to over $1.2 billion in takings.
Speaking in an official interview for the movie, shared on YouTube, Dornan reflected on his experiences of working with Johnson.
“Dakota’s an incredible actress, and a true professional,” he said.
Fifty Shades Freed stars Dakota Johnson and Jamie Dornan
The actors have always spoken positively of one-another
“As silly as she can be – and she can be very silly – she just has a great way of navigating every area Ana is put through.
“The humour of it, the heartbreak of it, the incredulousness of it. The struggle to understand Christian.
“She played all of those beats with such ease. She’s a very naturally gifted actor.”
Johnson, in her own one-to-one interview, was similarly complimentary about him.
The pair have had to film many sex scenes over the years
Christian and Ana married in Freed
“If we didn’t get along it would have been so heartbreaking because the reason why we have a special relationship on screen is because we have an even more special relationship off-screen,” she explained.
Johnson’s upcoming projects include a thriller with Armie Hammer, said to be fast-tracked for release in 2019.
She’s also currently shooting alongside Chris Hemsworth, while Dornan will shortly be seen in a new telling of Robin Hood.